Nozzle



' April 10, 1951 D. w. JUSTIS 2,548,725

NOZZLE Filed Nov. 18, 1949 MI 51 N DAV/0 W. Jus 77s Patented Apr. 10, 1 951 UNITED STATES PATENT: OFFICE 7 NOZZLE fnaviaw. Justis, Charlotte, N. c. Application November 18, 1949, Serial No'. 128,213

This invention relates to a nozzle and more especially to a nozzle adapted to be used with a cylinder containing gas such as-carbondioxide so that the gas may be released from the cylinder through the nozzle and will be emitted from the nozzle in a spray. i

It is well known that cylinders containing gas such as carbon dioxide are used asfire extinguishers and usually have a nozzle attached thereto or to a hose attached to thecylinder so that gas may be released from the cylinder and nozzle in a spray and directed to various spots where it is desired to spray the gas. Heretofore the nozzles employed on such cylinders have had a single bore in the base thereof. through which gas from the cylinder is admitted into the nozzle. Nozzles heretofore used have been flared or funnelshaped in order to break the vacuum due to the expansion of the gas. Now, as the gas would pass through thisbore into the nozzle it would expand rapidly to eitherjsid'e iof the nozzle and in so doing would tend to create'a vacuumat the base of the nozzle. This Vacuum would tend to pull the gas toward the basev of the nozzle and would; prevent it from beingsprayed very far from the end of the nozzle. The funnel shaped' nozzles heretofore used did not have carrying power to project the gas any substantial distance.

It is therefore an object of this invention to provide a nozzle having means at its base for admittingair to the nozzle adjacent the point where gas is admitted to the nozzle to prevent a vacuum from forming at the base of the nozzle and to give added force to the gas so that it will be emitted from the ends of the nozzle with a greater force and velocity and will consequently be sprayed a greater distance from the nozle than has heretofore been possible.

Some of the objects of the invention having been stated, other objects will appear as the description proceeds, when taken in connection with the accompanying drawings, in which Figure 1 is a side elevation of a cylinder of gas with my improved nozzle attached thereto;

Figure 2 is a vertical sectional view taken substantially along the line 2-2 in Figure 1 and showing the manner in which the nozzle is attached to the cylinder and also showing the structure of the base of the nozzle;

Figure 3 is a sectional view taken substantially alongthe line 33 in Figure 2.

Referring more specifically to the drawings the numeral l indicates a conventional cylinder of the type used in fire extinguishers and the like and which may contain various types of gases 3. Claims. (Cl. 169-31) 2 LL-af such as carbon dioxide. A valve housing I I having a conventional valve seat and closure, not shown, thereinis attached to one end of the cylinder I0 and connected to the valve in the housing I! is a conventional handle l2 fo opening and closing the valve within the valve housing H. The lower portion-of the valve housing H has a downwardly projecting portion l5 which is threaded for the reception of a suitable fitting such as the nozzle to be described. By referring to Figure 2 it will be observed that thedo'wnwardly projecting portionl5 has a bore I B therein and a flared out portion [1 and a larger bore E8 in communication therewith.

The present invention comprises a nozzle which is adapted to be threadably secured on theportion 15 and this nozzle comprises a baseor hub portion 29 which has a threaded bore 2| therein for reception of the threaded portion 15. 'This' threaded bore 2| is restricted at its left-hand end in-Fig-ure 2 as at 22 and communicates with a small bore 23 which extends through thehub portion and into the nozzle proper. The outer surface of the hub has a plurality of flat portions 1 24 to provide suitable surfaces which may be engaged by a wrench for securing the hub 20 to the projecting portion I5. A groove 25 is cut around the circumference of the hub portion at a point near its left-hand end in Figure 2.

The left-hand end of the hub in Figure 2 is restricted as at 26 and a cylindrical tube 2! is fitted therearound and secured thereto as by a pressed fit or by brazing, or this tube 21 may be a integral part of the hub 20. A plurality of substantially longitudinally extending bores 30 are cut in the hub 20 adjacent its circumference and these bores 39 communicate at one end with r the interior of the cylindrical tube 21 andat their other end with the circumferential groove 25.

It is thus seen that when gas is released from the cylinder ID by means of the valve in'the valve housing ll being opened this gas will pass through the valve and through the bore IS in the projecting portion I5 and will enter the bore 2| of the nozzle and will pass through the bore 23 into-the base of the nozzle at the juncture of the hub 20 with the cylindrical tube 21. Now when the gas flows through the bore 23 into the tube 21 it will expand thus tending to create a vacuum at the juncture of the hub 20 and the tube 21.

However, in the present invention a vacuum will not be formed due to the fact that the expanding gas will cause air from the atmosphere to flow into the tube 20 through the circumfemential groove 25 and the bores 30 to give the gas an added force and to cause it to be emitted from the end of the tube 21 with a greater force and velocity than has heretofore been possible. ,It is thus seen that this nozzle will permit the gas within the cylinder to be sprayed a greater distance from the end of the nozzle than has heretofore been the case.

The bores 30 are directed outwardly away from the longitudinal center of the tube 21 to thus cause the incoming air to wipe the walls of the tube 21.

In the drawings and specification there has been set forth a preferred embodiment of the in. vention, and although specific terms are employed, they are used in a generic and descriptive sense only, and not for purposes of limitation, the scope of the invention being defined in the claims.

I claim:

1, A nozzle having a hub portion and a tube portion having one of its ends fitted over the end of the hub portion, means for connecting the other end of the hub portion to a source of gas under pressure, said hub portion having at least one longitudinally extending bore for introducing the gas to the interior of the tube portion, the hub portion also having a peripheral groove therein adjacent the tube portion fitted over one end of the hub portion, and said hub portion having a plurality of substantially longitudinally extending bores thereinadjacent its circumference, said last-named bores communicating with the interior of the tube portion and with the peripheral groove of the hub portion whereby upon gas entering the tube portion and expanding, air will be drawn into the tube through the last-named bores from the atmosphere to prevent the crea tion of a vacuum in the tube and to wipe the interior surface of the tube.

2. A nozzle for spraying gas and the like comprising a hub having a threaded bore therein for connecting the nozzle to a source of gas under pressure, a cylindrical tube having one of its ends connected to the other end of the hub, said hub extending a substantial distance Within the cylindrical tube and having a groove around its circumference near the juncture of the hub and the tube, said hub having a centrally disposed bore therein communicating with the interior of the cylindrical tube and with the threaded bore, said hub also having a plurality of substantially longitudinally extending bores adjacent its circumference communicating with the interior of the tube and with the groove extending around the circumference of the hub.

3. A nozzle having a tube and a hub, means for connecting the hub to a suitable source of gas under pressure, said hub having at least one centrally disposed bore therein, said hub having a plurality of substantially longitudinally extending bores therein adjacent its circumference and whose axes when projected will strike the interior surf ce of the tube, said hub having a circumferential groove therearound, said lastnamed bores communicating with the interior of the tube and with the circumferential groove and said centrally disposed bore communicating with the interior of the tube and with the means for connecting the nozzle to a source of gas, where? by gas will pass through the centrally disposed bore and will expand within the interior of the tube and such expansion will cause air to be drawn into the tube through the bores adjacent the circumference of the hub to prevent the creae tion of a vacuum and to cause the gas to be emitted from the open end of the tube at a greater pressure.

DAVID W. JUSIIS.

RE ERENCE C TED The following references are of record in the file of this pa e t:

UNITED STATES PATENTS Number N me Date 1,229,327 Schnaier June 12, 1917 1,525,095 Josephson Feb. 3, 1925 2,216,071 Ensminger Sept, 194,0 2,218,189 Allen Oct. 15, 194i) FOREIGN PATENTS Number Country Date 842,145 France June 6, 1939 

